Unexpected actual parameter type for type – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when the type of parameter passed to a function or method in Elasticsearch does not match the expected type. This could be due to a programming error or incorrect data input. To resolve this issue, you can: 1) Check the function or method that’s throwing the error and ensure you’re passing the correct type of parameter. 2) Validate your data input to ensure it’s of the correct type before passing it to the function or method. 3) If the error persists, consider debugging your code to identify the exact point where the error occurs.

This guide will help you check for common problems that cause the log ” Unexpected actual parameter type [{}] for type [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: parser, plugin.

Log Context

Log “Unexpected actual parameter type [{}] for type [{}]” class name is ExpressionBuilder.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 return new Literal(source; converterFor(sourceType; dataType).convert(param.value); dataType);
 } catch (QlIllegalArgumentException ex) {
 throw new ParsingException(ex; source; "Unexpected actual parameter type [{}] for type [{}]"; sourceType; param.type);
 }  @Override
 public String visitString(StringContext ctx) {


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